Wheel Collider and physics...

Unity Engine
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1

I’m having an issue where my vehicle keeps jumping around when using Wheel Colliders. I followed the tutorial in Lesson 6.2 of the Unity Learning Pathway for junior programmers.
I already have the car at 2000 kilograms and I tried reducing the dampening but it still jumps around.
See my settings on the attached image file.

I’m using unity 2020.3.21f1.

Also, if anyone can also answer why do I need to AddRelativeForce of 25000 to make the car move. I thought Unity had physics based on real life? It never would take an engine to push 25k newtons to move a car… Shouldn’t it be F=ma, and since the friction on the wheel collider is .4, we should get F = 2000kg * .4, which is 800 newtons of force. >>> ? <<<

7607962--944932--ScreenS.png

2

Here is my image again, I may have reduced it too much.

7607971--944959--ScreenS2.jpg
7607971--944959--ScreenS2.jpg1500×825 148 KB

3

I know this is years old but I had a similar issue today so in case anyone else is searching for this.
For me, my car started bouncing when I added the line to lower the center of mass:

playerRb.centerOfMass = centerOfMass.transform.position;

and the fix was to use localPosition, I guess required because the centerOfMass game object was a child of the vehicle.

playerRb.centerOfMass = centerOfMass.transform.localPosition;

No idea why this wasn’t necessary when they wrote the tutorial, did I miss a step?